Hydrochloric Acid → Dimethyl [2-oxo-3-(pyrid-3-yloxy)propyl]phosphonate

참여 물질

반응 조건

반응 단계

n-Butyl-lithium (4.76ml. of a 2.1M solution in hexane) was added to a solution of dimethyl methylphosphonate (1.24g.) in dry tetrahydrofuran at -78°C. in an atmosphere of nitrogen. After 10 minutes, a solution of ethyl 3-pyridyloxyacetate (0.90g.) in dry tetrahydrofuran (5ml.) was added dropwise, and the mixture was stirred for 1 hour at -78°C. The reaction mixture was taken to pH 1-2 with 2N hydrochloric acid and the solvents were removed under reduced pressure. The residue was shaken with water (10ml.) and extracted with ether (3 × 10ml.). The extracts were discarded, and the aqueous solution was adjusted to pH 7-8 with sodium bicarbonate solution and extracted with chloroform (6 × 10ml.). The combined extracts were evaporated, to give dimethyl [2-oxo-3-(pyrid-3-yloxy)propyl]phosphonate as an oil, RF = 0.2 (10% methanol in ethyl acetate).

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